On Mar 2, 4:51 am, "David Wilson" <mcs6...@gmail.com> wrote: > 74xx = TTL = (10mW/10ns) > 74Lxx = Low Power TTL = (1mW/30ns) > 74Sxx = Schottky Diode TTL = (20mW/3ns) > 74LSxx = Low Power Schottky Diode TTL = (2mW/10ns) > 74ALSxx = Advanced Low Power Schottky Diode TTL = (1mW/4ns) Neat! I've never seen a table of the characteristics of the different 74xx part numbers.. Rich